"Well, this is the first time I've shared this, aside from giving my testimony [in church]," she said. "When I made a vow to God and to [Phil], it was March 22, 1964. ... It wasn't legal. That's the truth. We didn't do the legal papers until April 11, 1968, after Alan, my oldest, was born. Alan says, 'Yeah, I would be the B [bastard] in the family.'"

Phil and Kay Robertson are also parents to Willie, Jase, and Jep, all of whom are featured on the family's show, "Duck Dynasty."

But Kay Robertson maintains that she saw her union as official because of the vow she made to God.

"But I want to tell you something," she said. "My heart and my vow to God was true from the first day. ... Now, the family laughs about it. People ask, 'When was your mama's wedding?' and the boys say, 'Which, the pioneer wedding or the regular wedding?'"

The Robertson family's religious values also made headlines back in December when Phil Robertson made a series of anti-gay comments in an interview with GQ magazine in which he said homosexuality contributes to the deterioration of society.

"Start with homosexual behavior and just morph out from there — bestiality, sleeping around with this woman and that woman and that woman and those men," he said.

"Don't be deceived. Neither the adulterers, the idolaters, the male prostitutes, the homosexual offenders, the greedy, the drunkards, the slanderers, the swindlers — they won’t inherit the kingdom of God," Robertson continued, paraphrasing Corinthians. "Don't deceive yourself. It's not right."